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| <td class="back"><a id="top"></a><a href="s4.5.html" rel="prev"><< §4.5 Lifting and lowering</a></td> |
| <td class="top"><a href="index.html" rel="contents">↑ Table of Contents ↑</a></td> |
| <td class="next"><a href="s4.7.html" rel="next">§4.7 Callin binding with static methods >></a></td> |
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| <div class="breadcrumb"><a class="nav" href="s4.html" rel="section">§4 Callin Binding</a></div> |
| <div class="sect depth2" id="s4.6"> |
| <h2 class="sect">§4.6 Overriding access restrictions<a class="img" href="s4.6.html" |
| title="PermaLink to §4.6 Overriding access restrictions"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png" |
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| <p>Callin bindings may also mention inaccessible methods |
| (cf. decapsulation <a href="s3.4.html" title="§3.4 Overriding access restrictions" |
| class="sect">§3.4</a>). |
| Due to the reverse call direction this is relevant only for base calls within |
| <code>callin</code> methods. |
| Base calls have unrestricted access to protected base methods. |
| Accessing a base method with private or default visibility is |
| also allowed, but signaled by a compiler warning. |
| |
| </p> |
| <div class="note"> |
| <h5>Comment:</h5> |
| A base call to an inaccessible base method is considered harmless, |
| since this is the originally intended method execution. |
| |
| </div> |
| <div class="subsect depth3" id="s4.6.a"> |
| <h4 class="subsect">(a) <span class="title">Private methods from super classes</span><a class="img" href="s4.6.a.html" |
| title="PermaLink to (a) Private methods from super classes"><img style="vertical-align:text-top;margin-left:5px;" src="../images/permalink.png" |
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| <p><em>(Cf. <a href="s3.4.d.html" |
| title="§3.4.(d) Private methods from super classes" |
| class="sect">§3.4.(d)</a>)</em> |
| If a callin binding shall bind to a private base method, that method |
| must be defined in the exact base class to which the current role |
| class is bound using <code>playedBy</code>. |
| <br /> |
| If a private base feature must indeed be callin-bound, a role class |
| must be defined that is played by the exact base class defining the |
| private feature. Another role bound to a sub-base-class can then |
| be defined as a sub class of the first role. It will inherit the |
| callin binding and through this it can access the desired feature. |
| |
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| <td class="back"><a href="s4.5.html" rel="prev"><< §4.5 Lifting and lowering</a></td> |
| <td class="top"><a href="index.html" rel="contents">↑ Table of Contents ↑</a></td> |
| <td class="next"><a href="s4.7.html" rel="next">§4.7 Callin binding with static methods >></a></td> |
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| <div class="breadcrumb"><a class="nav" href="s4.html" rel="section">§4 Callin Binding</a></div> |
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| width="88" /></a><address>© Stephan Herrmann, Christine Hundt, Marco Mosconi</address> |
| OT/J version 1.3 — last modified: 2010-05-18 |
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